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<?php $array1 = [ [ "total_process_per_category" => "6", "category_id" => "1" ], [ "total_process_per_category" => "2", "category_id" => "2" ] ]; $array2 = [ [ "total_pinned_per_category" => "16", "category_id" => "1" ], [ "total_pinned_per_category" => "4", "category_id" => "2" ] ]; var_export( array_values( array_reduce( array_merge($array1, $array2), function ($result, $row) { $result[$row['category_id']] = ($result[$row['category_id']] ?? []) + $row; return $result; }, [] ) ) );
Output for git.master, git.master_jit, rfc.property-hooks
array ( 0 => array ( 'total_process_per_category' => '6', 'category_id' => '1', 'total_pinned_per_category' => '16', ), 1 => array ( 'total_process_per_category' => '2', 'category_id' => '2', 'total_pinned_per_category' => '4', ), )

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